mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-09 18:31:13 +00:00
98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
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* Copyright (C) 2017-2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(WEBASSEMBLY)
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#include "WasmFormat.h"
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#include "WasmLimits.h"
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#include "WriteBarrier.h"
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#include <wtf/Ref.h>
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#include <wtf/ThreadSafeRefCounted.h>
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namespace JSC { namespace Wasm {
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class Instance;
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class Global final : public ThreadSafeRefCounted<Global> {
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WTF_MAKE_NONCOPYABLE(Global);
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WTF_MAKE_FAST_ALLOCATED(Global);
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public:
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union Value {
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uint64_t m_primitive;
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WriteBarrierBase<Unknown> m_externref;
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Value* m_pointer;
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};
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static Ref<Global> create(Wasm::Type type, Wasm::GlobalInformation::Mutability mutability, uint64_t initialValue = 0)
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{
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return adoptRef(*new Global(type, mutability, initialValue));
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}
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Wasm::Type type() const { return m_type; }
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Wasm::GlobalInformation::Mutability mutability() const { return m_mutability; }
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JSValue get(JSGlobalObject*) const;
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uint64_t getPrimitive() const { return m_value.m_primitive; }
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void set(JSGlobalObject*, JSValue);
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void visitAggregate(SlotVisitor&);
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template<typename T> T* owner() const { return reinterpret_cast<T*>(m_owner); }
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void setOwner(JSObject* owner)
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{
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ASSERT(!m_owner);
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ASSERT(owner);
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m_owner = owner;
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}
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static ptrdiff_t offsetOfValue() { return OBJECT_OFFSETOF(Global, m_value); }
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static ptrdiff_t offsetOfOwner() { return OBJECT_OFFSETOF(Global, m_owner); }
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static Global& fromBinding(Value& value)
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{
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return *bitwise_cast<Global*>(bitwise_cast<uint8_t*>(&value) - offsetOfValue());
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}
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Value* valuePointer() { return &m_value; }
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private:
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Global(Wasm::Type type, Wasm::GlobalInformation::Mutability mutability, uint64_t initialValue)
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: m_type(type)
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, m_mutability(mutability)
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, m_value()
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{
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m_value.m_primitive = initialValue;
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}
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Wasm::Type m_type;
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Wasm::GlobalInformation::Mutability m_mutability;
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JSObject* m_owner { nullptr };
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Value m_value;
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};
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} } // namespace JSC::Wasm
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#endif // ENABLE(WEBASSEMBLY)
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